实验三LR1分析报告法JAVA.docx

1、实验三LR1分析报告法JAVA实验三 LR(1)分析法一、实验目的 构造LR(1)分析程序，利用它进行语法分析，判断给出的符号串是否为该文法识别的句子，了解LR（K）分析方法是严格的从左向右扫描，和自底向上的语法分析方法。二、实验内容对下列文法，用LR（1）分析法对任意输入的符号串进行分析： （1）E- E+T（2）E- ET（3）T- T*F（4）T- T/F（5）F- (E)（6）F- i三、LR（1）分析法实验设计思想及算法 (1)总控程序，也可以称为驱动程序。对所有的LR分析器总控程序都是相同的。(2)分析表或分析函数，不同的文法分析表将不同，同一个文法采用的LR分析器不同时，分析表将

2、不同，分析表又可以分为动作表（ACTION）和状态转换（GOTO）表两个部分，它们都可用二维数组表示。(3)分析栈，包括文法符号栈和相应的状态栈，它们均是先进后出栈。分析器的动作就是由栈顶状态和当前输入符号所决定。 LR分析器由三个部分组成： 其中:SP为栈指针，Si为状态栈，Xi为文法符号栈。状态转换表用GOTOi，X=j表示，规定当栈顶状态为i，遇到当前文法符号为X时应转向状态j，X为终结符或非终结符。 ACTIONi，a规定了栈顶状态为i时遇到输入符号a应执行。动作有四种可能：(1)移进： actioni，a= Sj：状态j移入到状态栈，把a移入到文法符号栈，其中i,j表示状态号。(2)

3、归约： actioni，a=rk：当在栈顶形成句柄时，则归约为相应的非终结符A，即文法中有A- B的产生式，若B的长度为R(即|B|=R)，则从状态栈和文法符号栈中自顶向下去掉R个符号，即栈指针SP减去R，并把A移入文法符号栈内，j=GOTOi,A移进状态栈，其中i为修改指针后的栈顶状态。(3)接受acc: 当归约到文法符号栈中只剩文法的开始符号S时，并且输入符号串已结束即当前输入符是#，则为分析成功。(4)报错:当遇到状态栈顶为某一状态下出现不该遇到的文法符号时，则报错，说明输入端不是该文法能接受的符号串。四、实验要求1、编程时注意编程风格：空行的使用、注释的使用、缩进的使用等。2、如果遇到

4、错误的表达式，应输出错误提示信息。 3、程序输入/输出实例： 输入一以#结束的符号串(包括+*/（）i#)：在此位置输入符号串 输出过程如下：步骤 状态栈 符号栈 剩余输入串 动 作 1 0 # i+i*i# 移进 i+i*i的LR分析过程步骤状态栈符号栈输入串动作说明10#i+i*i#ACTION0,i=S5,状态5入栈205#i+i*i#r6: Fi归约,GOTO(0,F)=3入栈303#F+i*i#r4: TF归约,GOTO(0,T)=3入栈402#T+i*i#r2: ET归约,GOTO(0,E)=1入栈501#E+i*i#ACTION1,+=S6,状态6入栈6016#E+i*i#ACT

5、ION6,i=S5,状态5入栈70165#E+i*i#r6: Fi归约,GOTO(6,F)=3入栈80163#E+F*i#r4: TF归约,GOTO(6,T)=9入栈90169#E+T*i#ACTION9,*=S7,状态7入栈1001697#E+T*i#ACTION7,i=S5,状态5入栈11016975#E+T*i#r6:Fi归约,GOTO(7,F)=10入栈120169710#E+T*F#r3: TT*F归约,GOTO(6,T)=9入栈130169#E+T#r1:EE+T,GOTO(0,E)=1入栈1401#E#Acc：分析成功4、输入符号串为非法符号串(或者为合法符号串)算术表达式文法的

6、LR分析表状态ACTIONGOTOi+*()#ET F0S5S41231S6acc2r2S7r2r23r4r4r4r44S5S48235r6r6r6r66S5S4937S5S4108S6S119r1S7r1r110r3r3r3r311r5r5r5r55、实验源程序LR.javaimport javax.swing.*;import java.awt.Dimension;import javax.swing.JButton;import java.awt.Rectangle;import java.util.Vector;import javax.swing.JTextArea;import j

7、avax.swing.JTextField;import javax.swing.JLabel;import javax.swing.JMenuBar;import javax.swing.JMenu;import javax.swing.JMenuItem;import javax.swing.JScrollPane;import java.awt.BorderLayout;import javax.swing.JDialog;public class LR extends JFrame private static final long serialVersionUID = 1L; /*

8、private char VN =new char50; /非终结符集 private char VT =new char50; /终结符集 private String F =new String50; /产生式集 private StringBuffer FirstVN; /非终结符的First集 private int staStack =new int50; /状态分析栈 private char symStack =new char50; /符号分析栈 private booleanVNE; /非终结符与空串的关系表 private int F_index =0; /产生式数组指针

9、private int staStack_index=0; /状态栈指针 private int symStack_index=0; /符号栈指针 private int ERROR =Integer.MAX_VALUE; /出错标志 private char emp =; /空串 private String error =x; /分析表显示的出错标志 / jve:decl-index=0: private String acc =acc; /分析表显示的分析成功标志 private VectorVector State =new VectorVector(); /项目集 / jve:dec

10、l-index=0: private int Action; /Action动作数组 private int Goto; /Goto动作数组 private StringBuffer bridge1; /描述项目集之间的转换关系，在createLR1()中初始化 private int bridge2; private JPanel jContentPane = null; private JTextArea jTextArea4 = null; private JTextArea jTextArea3 = null; private JTextArea jTextArea2 = null;

11、private JTextArea jTextArea_LR1States = null; private JTextArea jTextArea_LR1AnalysisTable = null; private JTextField jTextField = null; private JTextField jTextField1 = null; private JTextField jTextField_testedString = null; private JLabel jLabel = null; private JLabel jLabel1 = null; private JLab

12、el jLabel_LR1States = null; private JLabel jLabel_inputString = null; private JButton jButton_test = null; private JButton jButton_ok = null; private JButton jButton_delete = null; private JButton jButton_clearall = null; private JButton jButton_testPanel = null; private JMenuBar jJMenuBar = null; p

13、rivate JMenu jMenu1 = null; private JMenuItem jMenuItem1 = null; private JMenuItem jMenuItem2 = null; private JScrollPane jScrollPane_LR1States = null; private JScrollPane jScrollPane_LR1AnalysisTable = null; private JScrollPane jScrollPane2 = null; private JScrollPane jScrollPane3 = null; private J

14、ScrollPane jScrollPane4 = null; private JPanel jPanel = null; private JPanel jPanel1 = null; private JLabel jLabel_LR1AnalysisTable = null; private JButton jButton_fresh = null; private JButton jButton_TransFunGraph = null; private JFrame jFrame_testFrame = null; / jve:decl-index=0:visual-constraint

15、=531,25 private JPanel jContentPane_testFrame = null; private JDialog jDialog_TG = null; / jve:decl-index=0:visual-constraint=170,520 private JPanel jContentPane_TG = null; public LR() super(); initialize(); private void initialize() this.setSize(583, 483); this.setJMenuBar(getJJMenuBar(); this.setC

16、ontentPane(getJContentPane(); this.setTitle(LR1语法分析); this.setLocation(300,250); this.setVisible(true); private JPanel getJContentPane() if (jContentPane = null) jContentPane = new JPanel(); jContentPane.setLayout(null); jContentPane.add(getJPanel(), null); jContentPane.add(getJPanel1(), null); retu

17、rn jContentPane; private JPanel getJPanel() if (jPanel = null) jPanel = new JPanel(); jPanel.setLayout(null); jPanel.setBounds(new Rectangle(0, 0, 210, 430); /jPanel.setBackground(Color.green); jPanel.add(getJScrollPane4(), null); jPanel.add(getJScrollPane3(), null); return jPanel; private JPanel ge

18、tJPanel1() if (jPanel1 = null) jPanel1 = new JPanel(); jPanel1.setLayout(null); /jPanel1.setBackground(Color.green); jPanel1.setBounds(new Rectangle(210, 0, 368, 430); jLabel1 = new JLabel(); /jLabel1.setForeground(Color.red); jLabel1.setBounds(new Rectangle(120, 58, 23, 24); jLabel1.setText(-); jLa

19、bel = new JLabel(); /jLabel.setForeground(Color.red); jLabel.setBounds(new Rectangle(16, 19, 57, 23); jLabel.setText(产生式：); jPanel1.add(jLabel, null); jPanel1.add(getJTextField(), null); jPanel1.add(jLabel1, null); jPanel1.add(getJTextField1(), null); jPanel1.add(getJButton_delete(), null); jPanel1.

20、add(getJButton_ok(), null); jPanel1.add(getJButton_clearall(), null); jPanel1.add(getJButton_testPanel(), null); jPanel1.add(getJScrollPane2(), null); return jPanel1; private JPanel getJContentPane_testFrame() if (jContentPane_testFrame = null) jContentPane_testFrame = new JPanel(); jContentPane_tes

21、tFrame.setLayout(null); jContentPane_testFrame.setBackground(null); jContentPane_testFrame.add(getJScrollPane_LR1States(), null); jContentPane_testFrame.add(getJScrollPane_LR1AnalysisTable(), null); jLabel_inputString = new JLabel(); jLabel_inputString.setText(请输入待测句子：); jLabel_inputString.setBounds

22、(new Rectangle(29, 25, 108, 18); jContentPane_testFrame.add(jLabel_inputString, null); jContentPane_testFrame.add(getJTextField_testedString(), null); jContentPane_testFrame.add(getJButton_test(), null); jContentPane_testFrame.add(getJButton_fresh(), null); jContentPane_testFrame.add(getJButton_Tran

23、sFunGraph(), null); jLabel_LR1States = new JLabel(); jLabel_LR1States.setText(LR1项目集); jLabel_LR1States.setBounds(new Rectangle(11, 65, 65, 18); jLabel_LR1States.addMouseListener(new java.awt.event.MouseAdapter() public void mouseReleased(java.awt.event.MouseEvent e) jTextArea_LR1States.setText(); /

24、准备数据 createAll(); /显示项目集 displayLR1States(); /*public void mouseExited(java.awt.event.MouseEvent e) jLabel_LR1States.setForeground(Color.black); public void mouseEntered(java.awt.event.MouseEvent e) jLabel_LR1States.setForeground(Color.green); */ ); jContentPane_testFrame.add(jLabel_LR1States, null)

25、; jLabel_LR1AnalysisTable = new JLabel(); jLabel_LR1AnalysisTable.setText(LR1分析表); jLabel_LR1AnalysisTable.setBounds(new Rectangle(264, 67, 66, 18); jLabel_LR1AnalysisTable.addMouseListener(new java.awt.event.MouseAdapter() /*public void mouseExited(java.awt.event.MouseEvent e) jLabel_LR1AnalysisTab

26、le.setForeground(Color.black); public void mouseEntered(java.awt.event.MouseEvent e) jLabel_LR1AnalysisTable.setForeground(Color.green); */ public void mouseReleased(java.awt.event.MouseEvent e) jTextArea_LR1AnalysisTable.setText(); createAll(); displayLR1AnalysisTable(); ); jContentPane_testFrame.a

27、dd(jLabel_LR1AnalysisTable, null); return jContentPane_testFrame; private JDialog getJDialog_TG() if (jDialog_TG = null) jDialog_TG = new JDialog(); jDialog_TG.setSize(new Dimension(361, 266); /jDialog_TG.setTitle(LR1状态图); /jDialog_TG.setBackground(Color.black); jDialog_TG.setLocationRelativeTo(jFra

28、me_testFrame); jDialog_TG.setContentPane(getJContentPane_TG(); return jDialog_TG; private JPanel getJContentPane_TG() if (jContentPane_TG = null) /jContentPane_TG = new TransformGraphPanel(); jContentPane_TG.setLayout(new BorderLayout(); return jContentPane_TG; private JTextField getJTextField() if (jTextField = null) jTextField = new JT